SQL Subqueries Explained: Types and Usage in Oracle Database 🎓

Описание: Dive into the world of SQL subqueries with this comprehensive guide! Whether you're a beginner or an experienced database developer, understanding subqueries is crucial for writing efficient and powerful SQL queries. In this video, we explore the different types of subqueries in Oracle Database, including single row subqueries, multiple row subqueries, correlated subqueries, scalar subqueries, inline views, and EXISTS subqueries.

00:00 Types of SQL Subquery - A subquery is a query within another query.
01:16 Single-Row Subquery - is a type of query in Oracle that returns only one row of data.
01:47 Multiple-Row Subquery - is a query in Oracle that returns more than one row of data.
02:19 Correlated Subquery - is a type of query in Oracle that depends on data from the main query.
02:53 Scalar Subquery - is a query in Oracle that returns a single value, like one specific number or piece of text.
03:23 Inline View - is a subquery in Oracle that you use in the FROM clause of a query, treating its results like a temporary table.
03:54 Exists Subquery - is a type of query in Oracle used to check if any rows meet certain conditions.

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